A very challenging but very thought out portal mod, just like Portal Pro this mod is a masterpiece of puzzle solving. Was hoping for some more story based ending, but personally that is also forgivable. Did often come across annoying glitch though where I get killed the moment I go through a portal devoid of nearby hazards. Finding the third bonus cake was pure evil, don't ever make something so tedious again.

Map design: Excellent
Voices and humor: Excellent
Use of custom content: Excellent, even though there wasn't too much new. It was good that the original Portal feel was kept.
Difficulty: Hard/Expert

It was so tempting to find spoilers for some of the puzzles, but I managed to do them all without cheating. It took forever. I almost never do that for puzzle games/mods but this was well made and it was worth it.

I normally don't give 10 to puzzle-only mods but I honestly can't find any reason to complain about this. :/